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The mean iq of the sample is 105 is there enough evidence

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The average IQ of an adult population is 100 with a standard deviation of 15. A researcher decides to test the IQ of 75 random adults because it is believed this value has changed. The mean IQ of the sample is 105. Is there enough evidence to suggest that the average IQ has changed?

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Basic Statistics: The mean iq of the sample is 105 is there enough evidence

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